Browsing by Author "Chin, See Leang"

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Lasing action in water vapor induced by ultrashort laser filamentation
(2013-06-03)
Yuan, Shuai
;
Wang, Tiejun
;
Teranishi, Yoshiaki
;
Sridharan, Aravindan
;
Lin, Sheng Hsien
The water vapor fluorescence in air from filaments generated by intense ultrashort Ti:sapphire laser pulses is experimentally studied. The backscattered fluorescence from OH shows an exponential increase with increasing filament length, indicating amplified spontaneous emission. By measuring the intensity inside the filament and the fluorescence intensity of OH, a high degree of nonlinearity is obtained, indicating a highly nonlinear field dissociation of H2O molecule. (C) 2013 AIP Publishing LLC.
Neutral Dissociation of Superexcited Oxygen Molecules in Intense Laser Fields
(2010-03-11)
Song, Di
;
Azarm, Ali
;
Kamali, Yousef
;
Liu, Kai
;
Xia, Andong
Superexcited States (SESs) of oxygen molecules and their neutral dissociation processes have been studied both experimentally and theoretically using intense femtosecond laser. We find that at the laser Intensity of similar to 2 x 10(14) W/cm(2), ultrashort laser pulse causes neutral dissociation of oxygen molecule by way of SESs. The dissociation products are the excited neutral oxygen atoms, which are observed that fluorescence,Spectroscopy. Laser power dependence of the fluorescence intensity shows that each molecule effectively absorbs ill average of tell laser photons. The total energy absorbed is sufficient to stimulate the molecule to many of the SESs The effect is equivalent to single photon excitation in the extreme-ultraviolet (XUV) region by synchrotron radiation (SR). Morse potential energy curves (PECs). are constructed for the SESs of O(2) molecules. In light of the PECs, predissociation mechanism is proposed for the neutral dissociation. Quasi-classical trajectroy (QCT) calculations show that the predissociation time is as short as 100 fs, which is consistent with our experimental measurement using ultrafast pump-probe technique
PREFACE
(2014-02-01)
Chin, See Leang
;
Chu, Shih-I
;
Lin, Sheng Hsien
;
Wang, Jypyng
;
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